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https://issues.apache.org/jira/browse/CASSANDRA-10887?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jeremy Hanna updated CASSANDRA-10887:
-------------------------------------
Labels: LWT (was: )
> Pending range calculator gives wrong pending ranges for moves
> -------------------------------------------------------------
>
> Key: CASSANDRA-10887
> URL: https://issues.apache.org/jira/browse/CASSANDRA-10887
> Project: Cassandra
> Issue Type: Bug
> Components: Coordination
> Reporter: Richard Low
> Assignee: sankalp kohli
> Priority: Critical
> Labels: LWT
> Fix For: 2.1.13, 2.2.5, 3.0.3, 3.3
>
> Attachments: CASSANDRA-10887.diff, CASSANDRA_10887_2.2.diff,
> CASSANDRA_10887_3.0.diff, CASSANDRA_10887_v2.diff, CASSANDRA_10887_v3.diff
>
>
> My understanding is the PendingRangeCalculator is meant to calculate who
> should receive extra writes during range movements. However, it adds the
> wrong ranges for moves. An extreme example of this can be seen in the
> following reproduction. Create a 5 node cluster (I did this on 2.0.16 and
> 2.2.4) and a keyspace RF=3 and a simple table. Then start moving a node and
> immediately kill -9 it. Now you see a node as down and moving in the ring.
> Try a quorum write for a partition that is stored on that node - it will fail
> with a timeout. Further, all CAS reads or writes fail immediately with
> unavailable exception because they attempt to include the moving node twice.
> This is likely to be the cause of CASSANDRA-10423.
> In my example I had this ring:
> 127.0.0.1 rack1 Up Normal 170.97 KB 20.00%
> -9223372036854775808
> 127.0.0.2 rack1 Up Normal 124.06 KB 20.00%
> -5534023222112865485
> 127.0.0.3 rack1 Down Moving 108.7 KB 40.00%
> 1844674407370955160
> 127.0.0.4 rack1 Up Normal 142.58 KB 0.00%
> 1844674407370955161
> 127.0.0.5 rack1 Up Normal 118.64 KB 20.00%
> 5534023222112865484
> Node 3 was moving to -1844674407370955160. I added logging to print the
> pending and natural endpoints. For ranges owned by node 3, node 3 appeared in
> pending and natural endpoints. The blockFor is increased to 3 so we’re
> effectively doing CL.ALL operations. This manifests as write timeouts and CAS
> unavailables when the node is down.
> The correct pending range for this scenario is node 1 is gaining the range
> (-1844674407370955160, 1844674407370955160). So node 1 should be added as a
> destination for writes and CAS for this range, not node 3.
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